What is z axis?

The Z-axis refers to the third dimension in the Cartesian coordinate system, which is perpendicular to both the X and Y axes. It extends out of the plane created by the X and Y axes, creating a three-dimensional space in which objects can be plotted and measured. The Z-axis is commonly used in computer graphics, robotics, and engineering, as well as in mathematics and physics. It is often used to represent depth, height, or elevation in three-dimensional objects and models. In digital model-making, a Z-axis arm is used for the cutting or shaping of a digital design into a physical model.